Failed to create Flash Loader.

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Yoon-Ki Hong

• February 09, 2025 15:40
• Edited

Hello.

I'm trying to convert Nuvoton's Flash Loader, which is written in assembler, into C language.

At first glance, it seemed like I only had to write the 'EraseSector' and 'ProgramPage' functions.

Even though I wrote it, it doesn't seem to download properly. Is there anything else I should add?

Please refer to the link below for the code I wrote.

https://github.com/mymy49/CrossworksForARM_Nuvoton_M43x/commit/4ebce5a7bb68e5c5b46e8aa71397dec260719c21#diff-8cd9e273dd63dee82d82cff25deed459a1550db563544d54d7c9ab727568fde2R57 

Thank you.

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  Jon Elliott

  • January 28, 2025 10:50

  The best way to debug a FLASH loader is to add calls to libmem_erase, libmem_write and libmem_flush directly after the call to libmem_m480_register_internal_flash_driver in loader.c and use the debugger to check that those functions work correctly.

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  Yoon-Ki Hong

  • January 29, 2025 02:13

  Hi Jon Elliott sir,

  I will try the method you suggested.

  Thank you!!

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  Yoon-Ki Hong

  • February 04, 2025 15:09
  • Edited

  Hi Jon Elliott sir,

  The program download was successful. However, a different value is written to address 0x80, as shown in the image below.

  

  Is there any way to debug the above symptoms?

  Thank you.

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  Yoon-Ki Hong

  • February 09, 2025 15:38

  Hi Jon Elliott sir,

  It's finally working properly. I made a mistake while reimplementing the assembly code for M480 into C source code.

  I feel so good! thank you!

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  Jorden james

  • March 04, 2025 07:11

  Hey Yoon-Ki Hong,

  Aside from implementing EraseSector and ProgramPage, ensure memory mapping, timing, and register operations match the original assembly. Also, check for stack handling, compiler optimizations, and debugging outputs. Debugging complex issues like this can be as tricky as perfecting a recipe for delicious food! If it still fails, could you share more details on the issue?

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  Yoon-Ki Hong

  • March 04, 2025 12:36

  Hi Jorden james,

  The job is now completed and working fine.

  This was a problem that occurred when I was translating assembly code to C and copying code that I didn't understand. I don't understand exactly what the purpose of the assembly code lines in the link below are.

  https://github.com/mymy49/CrossworksForARM_Nuvoton_M43x/blob/282ed35384309b2e86320677144fc5836088570d/targets/M43x/Loader/M43x_AP_128_flm.s#L55 

  I removed the parts that were incorrectly translated into C language, as shown in the link below. it works normally.

  https://github.com/mymy49/CrossworksForARM_Nuvoton_M43x/commit/8c25ad678a06850ff581416132ca4b37fcdc3b73#diff-fbbed4c4ebd684805ac2c2a57bfad3346d780c3c14e46367c8604452e1d6b6e7L47 

  Thank you!!

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